{
    "id": "CVE-2026-33534",
    "published": "2026-04-13 20:16:33",
    "last_modified": "2026-06-17 10:37:40",
    "cvss_score": "4.3",
    "cvss_severity": "MEDIUM",
    "cvss_version": "3.1",
    "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
    "cwe": "CWE-918",
    "description": "EspoCRM is an open source customer relationship management application. Versions 9.3.3 and below have an authenticated Server-Side Request Forgery (SSRF) vulnerability that allows bypassing the internal-host validation logic by using alternative IPv4 representations such as octal notation (e.g., 0177.0.0.1 instead of 127.0.0.1). This is caused by HostCheck::isNotInternalHost() function relying on PHP's filter_var(..., FILTER_VALIDATE_IP), which does not recognize alternative IP formats, causing the validation to fall through to a DNS lookup that returns no records and incorrectly treats the host as safe, however the cURL subsequently normalizes the address and connects to the loopback destination. Through the confirmed /api/v1/Attachment/fromImageUrl endpoint, an authenticated user can force the server to make requests to loopback-only services and store the fetched response as an attachment. This vulnerability is distinct from CVE-2023-46736 (which involved redirect-based SSRF) and may allow access to internal resources reachable from the application runtime. This issue has been fixed in version 9.3.4.",
    "epss_score": "0.01684",
    "epss_percentile": "0.76307",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 1,
    "updated_at": "2026-10-09 18:17:54",
    "priority": {
        "rank": 2,
        "label": "Patch early",
        "why": "A public exploit exists."
    },
    "products": [
        {
            "vendor": "espocrm",
            "product": "espocrm"
        }
    ],
    "kev_detail": null,
    "exploits": [
        {
            "source": "exploit-db",
            "ref_id": "52583",
            "title": "EspoCRM 9.3.3 -  SSRF",
            "date": "2026-05-27",
            "url": "https://www.exploit-db.com/exploits/52583"
        }
    ],
    "refs_list": [
        "https://github.com/espocrm/espocrm/releases/tag/9.3.4",
        "https://github.com/espocrm/espocrm/security/advisories/GHSA-h7gx-8gwv-7g73",
        "https://github.com/espocrm/espocrm/security/advisories/GHSA-h7gx-8gwv-7g73"
    ]
}